Quote:
Originally Posted by AlexanderHowl
I generally use a volumetric analysis, with the density of liquid hydrogen as the baseline, for massive installations).
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Liquid Hydrogen, with a density of about 0.07 t/m^3, makes for very light structures that are mostly empty space. It might be appropriate for a universe where spaceships are built like jet liners or modern space vessels.
I think a better rule of thumb for one like Star Wars where the interiors of spaceships look like water vessels is the old rule of thumb of 100 cubic feet per ton, which is about 0.35 t/m^3, depending on the ton you use.
If the Death Star was 100 miles in diameter, it would have a volume of 7.7 x 10^16 cubic feet, and thus mass about 7.7 x 10^14 tons.